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20. CHECKS AND MAINTENANCE
To ensure perfect safety and efficiency of the machine over time, it is necessary to carry out routine, preventive and special maintenance. In
particular, it is advisable to carry out an overall check of the machine at least once a year.
Machine
•
Carry out cleaning as described in the previous chapter on a daily basis.
•
Every four months replace the perforated disk (2) and the undercup seal (4) of the delivery group
(use only original spare parts) proceeding as follows:
- loosen the screw (1);
- remove the containment ring(3);
- replace the group perforated disk(2) and the rubber undercup seal (4);
- put the components back in place.
•
At least once a year, check for proper operation of the negative pressure valve, pressure limiting valve
and non-return drain valve. In the event of malfunction they must be replaced. For the checks, proceed
as follows:
negative pressure valve
- Turn the machine off;
- by means of the steam valves, release all pressure in the boiler;
- turn the machine back on and check closure of the valve.
pressure limiting valve
- Lock the pressure switch contacts.
- wait for pressure in the boiler to rise and check for intervention
of the valve at a maximum pressure of 2 bar.
Non-return drain valve
- Activate the delivery groups for about 30 seconds;
- attach a filter holder (5) with a gauge (available on request) to the delivery group;
- activate the delivery group, and use the gauge (6) to monitor pressure increase up to 8-9 bar;
- check the increase of pressure due to the expansion of the heated water up to a value of approximately 12 bar: reaching this value
confirms proper operation of the valve and the seal of the gaskets and solenoid valves;
- de-activate the deliveries;
- repeat the control on the other delivery groups.
•
Periodically check water pressure during coffee delivery. Check the pressure indicated on the gauge, which must be between 8 and 9 bar
inclusive.
•
Monitor the boiler pressure value as explained in chapter 1, "Technical characteristics".
•
Periodically check the condition of the filters. Check for any damage on the edge of the filters and check whether any coffee grounds
settle in the coffee cup.
•
At least once a year, check for proper operation of the gauge and pressure switch;
•
At least once a year check for lime scale deposits on the heating element, on the exchanger (inside and out) and on the hydraulic circuit.
When replacing any components, always replace the relative gasket as well.
•
At least once a year, check the condition of the solenoid valve of the delivery group.
•
At least once a year check for trace water leaks on the counter. Also check the condition of the discharge tub and its connection to the
sewer system.
Grinder-doser
Periodically check the dose of ground coffee (inclusive between 6 and 7 gr. per stroke) and check the degree of grinding. The grinders
must always have sharp cutting edges. Their deterioration is indicated by the presence of too much powder in the grounds. It is advisable to
replace the grinders after every 400/500 kg of coffee.
Softener
The build-up of lime scale deposits in the hydraulic circuit of the machine indicates that regeneration has been neglected. Carry out mainte-
nance of the boiler and of the hydraulic circuit, replacing any components as required.
Use care in areas where the water is very hard. It will be necessary to regenerate at more frequent intervals; likewise if there is high con-
sumption of hot water for tea and so forth.
espresso coffee machine - instructions for technician
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